微细浸染型联合村式金矿的地质和地球化学特征

GEOLOGICAL AND GEOCHEMICAL CHARACTER OF LIAN HECHUN (MICROGRAIN-DISSEMINATED TYPE) GOLD DEPOSIT

微细浸染型联合村式金矿的容矿岩石为印支晚期S型花岗斑岩.矿体的分布受侵位后的脆性剪切带控制.Au、Ag、As、Sb、Hg、Cu、Pb、Zn、Tl、Se、Te、Mo、Ba元素组合及其丰度,与美国卡林型金矿基本相同.金矿的浅部发育热液酸滤蚀变带.主要金属矿物是黄铁矿和辉锑矿等.金矿物粒径均小于0.1μm.单体金占总含金量的91.6%.燕山晚期花岗斑岩是金矿成矿作用的热源,而且岩浆期后热液体系的末端掺入了热卤水循环,带入了金、钨等元素.成矿元素主要来自原生和次生含金地质建造.

The host rock of the gold deposits of Lianhechun style is the granitic-porphyry of S type of late Indo-China. Gold ore bodies are controled by brittle shear zone. The element association and abundnance of Au、Ag、As、Sb、Hg、Cu、Pb、Zn、Tl、Se、Te、Mo Ba, are similar to that of carlin type. Acid leaching alteration zone occurs at shallow part. Ore minerals are mainly pyrite, stiblite ect. Grain sizes of native gold are all less than 0.1μ.91.6 percent of thtm occur in independent grains. The granite of late Yan-Shanian period was not only the heat source of the mineralization, but also made magmatic hydrothermal solution be mixed with the circulating hot brine, by which the elements such as Au、W ect have been provided. The source of elements of mineralization should be primary and secondary gold-bearing geological formations.